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23 Post-employment benefits (Details 9)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Plan III [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service R$ 4,037
Estimated cost of interest 183,865
Expected return on plan assets (183,026)
Expected employee contributions (2,018)
Costs (income or loss) 2,858
Assistance Plan [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service 20,854
Estimated cost of interest 85,561
Expected return on plan assets (12,066)
Expected employee contributions
Costs (income or loss) 94,349
Unified Plan [Member]  
Disclosure of defined benefit plans [line items]  
Cost of current service 765
Estimated cost of interest 405,370
Expected return on plan assets (449,905)
Expected employee contributions (187)
Costs (income or loss) R$ (43,957)